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- W40598070 abstract "Limited proteolysis of rabbit skeletal-muscle AMP deaminase (AMP aminohydrolase, EC 3.5.4.6) with trypsin results in conversion of the enzyme into a species which over the pH range 6.5-7.1 exhibits hyperbolic kinetics at low K+ concentration even in the absence of ADP, but shows a 20% decrease in activity at saturating substrate concentration. Analysis by sedimentation-equilibrium techniques reveals the proteolysed enzyme to be homogeneous and to have a molecular mass of 222,000 Da, indicative of a trimeric structure with a subunit molecular mass of 72,000 Da, in contrast with the tetrameric structure of the native enzyme, composed of four 79,000-Da subunits. These observations suggest a role of the 7,000-Da fragment which is removed by proteolysis in the maintenance of the three-dimensional structure of the subunit that causes the enzyme at low K+ concentration to show homotropic positive co-operativity. Study of the influence of pH, isolated from that of K+, on the kinetics of AMP deaminase reveals a highly pH-dependent inhibitory effect by ATP which is completely absent at acid pH values and abruptly manifests itself just above neutrality. This phenomenon may have significance in the metabolism of exercising muscle, in connection with the pH-dependent interaction of AMP deaminase with the thick filament." @default.
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- W40598070 title "Regulation of skeletal-muscle AMP deaminase. Evidence for a highly pH-dependent inhibition by ATP of the homogeneous derivative of the rabbit enzyme yielded by limited proteolysis" @default.
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- W40598070 doi "https://doi.org/10.1042/bj2720755" @default.
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